Iron mold for casting rolls for rolling mills



T. WEYMERSKIRCH. IRON MOLD FOR CASTING ROLLS FOR ROLLING MILLS.

APPLICATION FILED AUG.26, 192i.

Patented Dec. 12, 1922.

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)hren/or APPLICATION FILED AUG.26. 192|.

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T. WEYMEBSKIRCH. IRON MOLD FOR CASTING ROLLS FOR ROLLING MILLS.

APPLICATION FILED AUG.26. 1921.

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IRON MOLD FOR CASTING ROLLS VFORv ROLLING MILLS. APPLlcAnoN msoAu's.z6.19z|.

1,438,677, Patented Dec. 12, 1922.`

7 SHEETS-SHEET 4.

T. WEYMEHSKIRCH. IRON MOLD FoR cAsnNGRoLLs Foa ROLLING MILLS.

APPLICATION FILED AUG.'26. 1921.

fforney T'. WEYMERSKIRCH. IRON MOLD FOR CASTING ROLLS FOR ROLLING MILLS.

APPLICATION FILED AUG.26. 192|.

Patented Dec. 12, 1922.-

ISHEETs-SHEEI e.

ffy/f T. WEYMERSKIRCH. IRON MOLD FOR CASTING ROLLS FOR ROLLING MILLS.

' APPLICATION FILED AUG.26, 1921.

Pate'nted 1560.121922.

Patented Der. l2, i922.

unitn annonce Wiart/innestate, or trasmesse; tonni-renne. y'

BON AIVOLD FOR CASTNG RLLS RDLLNG v'ILLS.

Application filed .August 26,1921.. Serial No. 495,523.

T0 (all whom t may concern.' o

Be it known that l, Trinonon Tsi/'Mns sinner-r, engineer, a citizen oiLuxemburg, residing` at and whose post-oihce address is Diil'erdino'enLuxemburg'. Huttenlasino D 3 Uf 7 Luxemburg', have invented certain newand useful linprovenients in lron li/iolds for Casting' Rolls forBolling` lvlills (for which l have iiled applications in `Germany on.fl-"tugiist l1, 1919 May 10, 1920. and Deeernher 6, 1920)7 of which thefollowing is a specification.

The rolls used in rolling iron `o'l different sections, specially thosewith deep grooves and with sides which are parallel or almost parallel?are at the presenti time almost eis cliisively formed of soft. vcastiron. lollsoit this type are very seldom inade oitv a hard material orwith chilled surfaces. since on` forming; the `@grooves oi' passes allthe 'hard skin is reinoved and the value o j the 'chilling' heensuccessful, 'since the rigid molds use do not vallow of provision forthe shrinkage ot the rolls after casting. l

' l-tolls cast in these inolds oltcn hrcalt up. More especially,

that is between two collarsn are exposed to an extreme risk ot breakage,with the result 'that the rolls are useless and iniist he again inelteddown.

y Bitterent processes are known for making gi'ooied rolls in which themolds divided in the axial direction sol thatthey can er:- vpandtransversely? hut are otherwise tectly rigid. molds, as soon as "theshrinkage `con the parte o? .the inold are ldrawn fi allow aniininipeded shrinkage olf the rolls. This worl is, however, sodangeroiisandims'alfe that for a long time this method heen abandoned. ot theparte are already present,

hut it often happens that the parts are withdrawn too soon so: that theglowing particles hreak apart. Thisv process is not only veryineiiicienti hut' it.V

also introduces a great danger for the op- 'erators nient of vanordinary '.sniootli, round-and Another process `depends on the'employfei'iil passes theV parts within the passesj w oardened.

vWilli-zn rolls arecast in these q Usually the withdrawal` takes placetoo late when cracks` rigid mold in which the rings forming the passesare Inovahly inserted. rthese/rings which in comparison with the usualrigid inolds have only a sinall cross sectiony are very quickly raisedin temperature and on expansion are so jammed in the inoldthat' theycannot follow' the shrinkage oi' the rolls. lit it he considered how.sensitive is the iron mass if only solidified on its outer surface itwill he seen that the smallest restriction can give rise to a rupture.lt this `fiction is considerable`it is cert-ain that the roll7 alterCasting, will he withdrawn from the mold in several pieces'. rlihe stilli'liiid inetal at tl core and the `outer soliditied surface allow novfriction hetween the.

ring and mold. .Alsddn this inethodno allowance is niade :tor shrinkagewithin a pass.

The process has. also, drawbacks. y

ln another process radially arranged iron hlocks arev inserted 'inaelayniold which can other considerable vive to the shrinkage within thepass. lu'

,. eonseduence oit the great weiglitfof these i hlocls and the usuallyweak clay sides ot the inolth `it extremely diflicult tofconstruct iriththesehloclrs a `inold having` sev- `eirooved inolth viththese `rae thelilocks zii-e suspended without anyJ -lined the lowei` pass ol a moldand fin consequence otthe .tact that the ghloclrs are einhedded` in theclay inold there is no chill.y A casting' is obtained "which is shrunklout onlyslightly 1 .elceoifdinpg to' the `invention all tlf fe di" iv.l.

V arranged over one` another. lt is almost impossible to construct aperfectly L. `hlocls. These niolds are not readily `portable,. sincehacks :ire ohviated and a perfect i he ohtained 4,hy simple roanipuvidedin the axial direction andialso `in the transverse direction into asniany `parts )as :may he necessary to forni` the required passes. Thelioints hetweenthe parts are utilized to providcuiortlie shrinkage oftheroll in all directionsyhut inore particularly within the grooves.A y i Ai Some examples 'of constructions accord ino' to the inventionl arerepresente'diin the accompanying drawings.

.i Figs.. el andv 2 show r the .diferenceflin ithe composition of thematerial in theknown and new'rolls.

Fig. 3 is alongitudinal section through a mold according to theinvention and Fig. e is a cross section of Fig. 3.

Fig. 5 is a longitudinal section through another mold in which the ringsare held `under spring pressure by movable sidev bolts.

Fig. 6 is a section on the line 6-6 of Fig. 5. i Fig. 7 is alongitudinal section of a mold in which the rings are carried byvertical bolts. D g

Fig. 8 shows a section on the line'S--S oi Fig. 7. A y i Fig. 9 shows `astill further subdivided ,mold on the left in elevation and on therightin a central section.

Fig. 10 isa section on the line k10---10 of ig. 9'.

Figs. 11-13 show on a larger scale details y of Fig. 9.

' Fig. 14.

`Figs 14 and 15 show respectively in section and side viewanotherconstruction or' the parts of the mold.

Fig. 16 is a section on the line 16-16 oli' i Figs. 17419 show detailsof Fig. 14, on a larger scale.

Figs. 1 and 2 are sections of cast rolls according respectively to theknown and new f process in which the hatched parts represent the chilledzones of the pass. It is known f that, inthe `old vform of mold in whichthe rolls were cast` cylindrically andthe A grooves were' turned out,only the outer parts `of the mold Awere hard` while with the newrnethodof casting-the chilled zoneis distributed uniformly over the wholeVsurface of the roll.

Thefmold accordingY to Figs. 3 and 4: comprises rings 1 which areloosely displaceable -V which pass through suiiiciently ings 5 so thateach ring before in a .casing 2; Thel rings 1 kare connected with thecasing 2 by bolts 3 and springs 4 wide opena and during the casting iscarried by the casing 2.

the upper ringare released suiiciently so that all the rings 1 arecompletely free.

Also, the casing 2 yis released at the flanges kv6 in order tofacilitate the expansion and vmovement of therings. v

In `order to provide for the shrinkage of` the rollsy in the axialdirection. the rings 1 are provided with a clearance 7, depending on thelength of the roll, so that they move 'in yaccordance with `theshrinkage of the 1roll. vIn order that this movement shall be in no wayrestricted, joints 8 between the different` rings are provided. withv acornbustible packing as commonly used in foundries, so that the fluidmetal as it rises in tbe'mold `cannot*,enter thesejoints, but

the packing is already consumedy when the shrinkage commences. Theconstruction of the mold shows that in spite or' its multiple parts therequired roll is made in the simplest possible manner and ensures thatthe shrinkage after `casting` shall not give rise to any drawbacks.

In themold shown in F ig. 5, the rings 1 are fastened by means of springbolts 3 to guidingrods 9 connected to the cylindrical casing. y i

In order to give the bolts'3a` better hold, each vertical row of springsif bears against a depending rod 10 which is secured to the upper boX ofthe mold. vIhe inner washers clined surfaces arranged in steps held byla wedge 13 in contact with the 14 of the mold." y

By driving in the wedge 13 the rod 12 is raised. The washers 11 aremoved by the pressure of the springs 4 away from the rod 10, that is,the bolts 3 are loosened. Conversely, by depressing the rod 12. thebolts 3are tightened. `The boltsl (Fig. 6) connecting the sections cithe rings 1 can be tightened or loosened inl the same manner.

In the mold shown in lFig. 7. the rings engaging one over another arearranged in `a casing 2 and are held at the required disupper flangemoldboz; and the rings 1 are'entirely free.

The `sections of the rings are. as seen in Fig.` 8. connected by bolts1.5 which are released by a rod 12.

In order to provide a greater radial movement for the ringsyarte'r theyare released vthey may be beveledA (F 5) `at their points ofengagerilent with the rod .9,so that they are raised when their guidesare depressed. For the same purpose the rods 9 are wedge formed in crosssectionat the joints of the ring sections as .shown in F 6.'

In the construction shown in Figs. .913, the whole rigid moldl ct iscomposed of a number of pass rings 1a, 1b, 1C, 1d, 71B, 1f, 1g, whichcan be divided horizontally,` and intermediate rings 1h, 1i, 1k, 11. s

The different parts of the mold are held in their right positionv bydistance 'pieces 22- which are threaded on screws -23 and engage inrecesses 24 of the parts of' the mold. The screws 23 which arerectangular below the thread, in order that the distance pieces 22m aybe more easily rotated afterthe casting is effected, are guidedv in theupper and lowerfboXes 25, 26. The `lower end ofthe screw 23 is securedin the-lowerI mold box by wedges 27, while the upper end of the screw 23is provided with a thread 28 and by a nut 29 presses the upper boX 25 onthe llO iasegevv parts of theinold. ln'this Way all thepaits of the moldandthe distance pieces in the recesses E24@l ofthe paitsfareas firmly`pressed togetheras if the mold Were made of a single piece.' i i i Evenunder the `greatest pressure Which can occur in casting, there-'can beno displaeementl of Athe membersof theimold. ln this Way'aii absolutesecurity, and therefore,y the greatest enactne'ss in the casting oit therolls are obtained. It is important that there should be the greatestaccuracy in these groovedrolls since in dual or triple rolls, two

the mold are released and rest loosely against y and surround thesolidified parts of the roll until the cooling` is complete. i f

By this subdivision, the mold can yeasily 'follow all the movements dueto the shrifnl-4 age ofthe roll Without the least hindrance. This methodisvery important in deep and high passes otWhieht-he sides are limitedby parallel or approximately' parallel collars. The danger ot breakageis in thiscase eX- tremelyvgreatj By the arrangement accord ing to theinventiomin `Which the mold Within the passeswcan be subdividedasyo'l'ten as necessary7 this danger is quite removed. In these moldsthe `most diicult sections can be cast exactly Without the smallestdanger of rupture. i

.In the sectional vietv oi' Fig. 9 some constructions of subdividedmolds are shown. The pass la represents a vpreliminary pass for girders,U iron, rails or the like." The central part Iot' the pass is closed bya ring 81 loosely inserted in the two niembersof the mold. The ringforms also theinterior et the mold and allows/for the shrinkage of thepass. i The pass '11"' represents around iron pass'. The mold membersrest- 'on one another at the middle of the passes and externally have awedge shape`.` When the pass shrinks the mold `members-told towards theexterior so that there is a corresponding clearance Within the pass. Inorder to tacil itate this folding the members of the mold arepreferablydivided axially to form four parts. All the rest of the moldcan be made in tWo parts. Obviously; every part ot the mold can bedivided axially into as many parts as may be required. lc represents apass for angle iron, four-sided iron or the like. The mold division ishere somewhat blunt in order to obtain an easier pass or `passes offother forms. between the dividing sur'laces there should mold jointWithout interfering in 'the least with the mobilityvvithin the pass.

l@ represents a pass for hat iron, U iron or the like. The division otthe mold is also' iirthis case stepped. Packing 32 is placed lbetweenthe joints. l rlhe pass le is for sleepers orsimilar sections. ln thiscase the `shrinliage of the pass is allowed for by parallelvdivisioiisurfaces `which are closed by a packing' 32 on the inside of the mold.The

`passes 1f,` lg are ,tor rails. Also, in these `cases the shrinkage ofthe pass is allowed for in j the* simplest manner.`

Other methods of division can lbe used for lt is necessary that besuiiicient play in order to allotv'ifo'r the shrinkage of the roll orpass. The rings are provided (Fig. l0) with ilaiigesS-S connect-` edbyscren7 threaded bolts' 3 which can, it

required, in dependenceon ythe sensitiveness ofthe-roll to be cast, beprovided -ivith springs 4. The axial and horizontal Joints `Within themold can he made tight with a foundry ceiiient, so that during thecasting the iron` as it rises cannot enter into these joints. Since the'lluid iron quickly solidities lon Contact with the Walls ot the passes,this packing need only operate for a short time. The particles can,`therefore. sinter and thereby avoid any restriction during the yieldingofthe mold. l

`In such molds rolls can be manufactured with the greatest exactiiess.The mold has i during andfafter the casting ot' the roll all theadvantages of the rigid molds and also those oit themovable molds, sinceallthe danger ot' binding is removed. rl'hese ironr molds canV beadvantageously employed for rolls castV in soft iron. rlhe parts of themolds then receive the torni .shown in Fig. Yll ivith ya covering 34eoffclay particles or other similar materials which are arranged ina moreor. less thick layer according to the degree oiE chill required.A Also,if only one portion of the mold is provided with the coating Sait can beadvantageously used for rolls which are to receive only a partialchillin .the passes. Fig'. l2 shows a construction of this kind in which thepass is hard` enedat the base and only the side surfaces areicoveredwith theceating which provided a softer casting. 13 shows such a passtor the manufacture ot hard collars and sott base in the pass. ln orderthat the particles may be retained at the `iron parts oft1 the mold anduwithstand the upward pressure due to the iron, these parts arepreferably proi'fided WithA dovetailed grooves. These constructions areonly given by Way of eX? ample and can be modified in many Ways.

Owing to the great accuracy in which the molds according to theinvention can be formed it is possible to use first pass rolls and rollsfor billets and the like formed from raw cast passes if the pass neednot vbe'ezr act to some tenths oi. a m1llnnetre,..cr if a perfectly neatand smooth section is-not required. Such rolls whichcan be used with#out removal of the hard skin are not easily damaged and haveconsequently an ex tremely long life. Forthe manufacture of ornamentaliron, fashioned fillets, ribbed iron (iron for ferro-concrete) or otherroller products which have igures, ribs or` the like let into or raisedon their upper surface, at"` the present 'timesteel rolls .of mean`lhardness which allow the surfaces to be cut are almost exclusivelyused. D

According to vthe invention, itis possible to cast theserolls invchilled castings vwith `sui'licient' exactness and smoothness. Suchfigured rolls yof hard material ontlast several steel rolls', whiletheir manufacture is considerably cheaper because. one mold may provideseveral castings of the same kind of roll. Also, the so-calledsharpening grooves, which are usual `with iirst pass rolls for theeasier handling of the material ,tobe rolled in the different grooves ofthe rolls, can be castr at the same time if this does not prevent theshrinkagewithin the particular grooves. In the construction `shown inFigs. 14h19 the different parts of the moldare held in their correctpositions by pointed screws 35 which are arranged in blocks 86. Thescrews B5 are held in the blocks 3G by nuts 37. The

blocks 36 are inserted in slots of the screws which'are connected by ahinged() with the mold. The engagement of the screws 35 in the joints ismoreclearly shown in: Figs.

y 17-19. As soon as the cast is completed, nuts 38 `on* the upper `endof thel screw 23 are released "and the screws folded down so that theblocks 86 can be removed with the screws 35. For the easier loosening ofthe nuts 38 a ball-bearing 39 isv inserted below them as a washer. l y vAll the described constructions are intended only as examples.Thefdivision and the means for holding vandreleasing the parts of themold can be altered in many' wayswithout changing the principleof theinvention. l

:Having now particularly described and ascertainedthefnature of my saidinvention and in what manner the same is to be performed, I declarethatwhat I claim is l. A mold comprising a plurality oi rings for makingchilled rolls,lcharacterized by the fact that between the ringsclearance is provided, the'parts forming the engagement of the :ringsclosing lthe inner` part of the mold and the rings being adapted tofollow the shrinkage of the casting.

2. A mold according to claim 1', in which they rings are held by boltsmovable under spring pressure,1.meansbeing provided for permitting themovement of the rings when the casting shrinks. J 1

3. A moldaccording to claim 1, in which a single unlocking device commonto all of the rings or yring sections is provided for releasing orloosening the "connection ofsaid rings or ring sections.` p

4. An ironmold in several parts for casting rolls, in which distancepiecesvor like members are inserted in the joints of the moldfor'maintaining the correct disposition of the passes andby means ofsuitable tensioning members serving also during the casting to join allthe parts together tofform a rigid structure.

" 5; A mold according to claim 4 in which the parts of the mold are soarranged within the different passes that they canfollow in anydirection the shrinkage of the roll after casting.

' 6. A` mold formed according-to claim 4, in` y'which exchangeabledistance rings are loosely inserted in the joints for giving therequired shape.

the shrinkage within a pass is allowed for bythe members lof the moldslbeing arranged close together at the passes and are wedge shaped attheir outer surfaces. l

8. A mold according to claimft, in which the parts of the movable moldmembers covered in known manner withI clay-or similar yparticles areprovided with dovetailed A mold according to claim et, in which

